apue——读目录操作

#define _POSIX_C_SOURCE 200809L

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/termios.h>

#if defined(MACOS) || !defined(TIOCGWINSZ)
#include <sys/ioctl.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>

#define MAXLINE 4096

#define FILE_MODE (S_IRUSE | S_IWUSR | S_IRGRP | S_IROTH)

#define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)

#define min(a,b) ((a) < (b) ? (a) : (b))
#define max(a,b) ((a) > (b) ? (a) : (b))
#define _POSIX_C_SOURCE 200809L

#inc